Adjustable internal gauge



Filed Jan. 22, 1923 H L PETERSON ET AL ADJUSTABLE INTERNAL GAUGE Zilliliill Feb. 10, 1925.

Patented Fat. 1c, 1925'.

UNITED STATES PERT-13.121? OFFICE.

HAROLD L. PETERSON, OF WORCESTER, AND STANLEY W. BATH, OF SHREWSBURY, M'ASSACHUSETTS, ASSIGNORS TO JOHN BATH & COMPANY, INC., 0]? VZOBCESTEB, 'MASSACHUSET'IS, A CORPORATION OF hIASSACI-IUSETTS.

ADJUSTABLE INTERNAL GAUGE.

Application filed January 22, 1923.

To all rwhom 2'2- may concern:

'Be it known that we, HAROLD L. PETERSON and STANLEY W. BATH, both citizens of the United States, respectively residing at Worcester and Shrewsbury, in the county of Worcester and State of Massachusetts, have invented a new and useful Adjustable Tnternal Gauge, of which the following is a specification.

This invention relates to an adjustable internal gauge of the type in which a plurality of gauge bars are adjusted radially by longitudinal'movement of a bar-supporting member. A gauge of this type is shown in the prior application of John Bath, Serial N o. 351,686,*filed January 15, 1920.

His the general object of our invention to improve the construction therein disclosed, to the intent that the gauge may be more easily assembled and adjusted and that it may bemore easily kept in good working condition.

With'this. general object in view, one feature of our invention relates to the provision of a .yielding thread tension by means of which a close smooth fit of the bar-supporting member on'the thread of the actuating "shaft may be. maintained.

Another feature relates to an improved construction by which end play of the gauge bars and other parts may be more conveniently-taken up.

Our invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown inthe'drawings in which Fig. 1 is a longitudinal sectional elevation of our improved gauge, taken along the irregular line 11 in Fig. 2;

Fig. 2 is an end view thereof;

Fig. 3 is a partial detail view of a partto be described;

Fig. 4 is a partial plan view of the gauge handle; and

Fig. 5 is a detail end elevation of an adjusting nut, looking in the direction of the arrow 5 in Fig. 1.

Referring to the drawings, we have shown a gauge of the general type disclosedin the prior application of John Bath, above noted, and comprising a handle or body 10 within which an actuating shaft 11 is ro- Serial No. 614,099.

tat-ably mounted. The shaft 11 is threaded at one end to fit a bar-supporting member 12, which is provided with longitudinally extended, dove-tailed guideways within which the gauge bars 13 are slidably mounted.

The gauge bars are also of dove-tailed cross-section and are wedge-shaped in -longitudinal section and the guideways are inclined relatively to the axis of the gauge. One or more of the bars 18 is provided with a radial slot 14: in which is fitted a key 15 mounted in a flange 16 at the end-ofthe body 10. This key and slot connection prevents angular movement of thebars 13' and supporting member 12 relativel-y'to the body 10, while at the same time permitting radial movement of the bars 13.

The handle end of the shaft 11 is enlarged, as indicated at 17, to provide a shoulder 18 engaging a corresponding shoulder within the body 10. A collar 19 is loosely mounted on the enlarged portion 17 of the shaft and is provided with serrations 20 co-operating with similar serrations 21 on the adjacent end of a sleeve22 which may be fixed to the shaft portion 17 by a binding screw 23.

The collar 19 is provided with graduations and the body 20 has a co-operating index mark adjacent the collar'19. The gauge may be set to a desired size by adjusting the gauge to a standard ring and then loosening the sleeve 22 and turning the collar 19 to bring the zero graduation opposite the index mark, as shown in Fig. 4. After being thus adjusted, the screw 23 may betightened to retain the parts in the desired relation.

The parts thus far described are similar to those shown in the prior application above noted and in themselves form no part of our present invention, the features of which will now be described.

One important feature of our invent-ion relates to a construction for providing a yielding tension between the thread on the actuating shaft 11 and the thread in the bar supporting member 12. For this purpose the member 12 is provided with a recess 24 within which is placed a relatively stifi coil spring 25. A nut 26 is threaded on the shaft 11 and is notched or slotted around its periphery, as indicated in Fig. 5. The nut may be adjusted by a suitable spanner the nut 26 and the threaded portion of the member 12 and thus provide a smooth even tensionon the actuating shaft 11. Furthermore, this tension is not dependent upon the exact closeness of fit between the threads of the member 12 and the shaft 11 and the tension is thus maintained substantially unchanged over a considerable range of wear in the threads. When once adjusted to provide the desired smooth tension between the parts, no further attention is ordinarily required during a long period of use.

Another feature of our invention relates to improved means for assembling the parts of the gauge. For this purpose the shaft 11 is provided with an axial opening 30 through which extends a rod 31. This rod is threaded at one end and at its opposite end is preferably provided with an enlarged conical head 32, as shown in Fig. 3. This head 32 fits a conical recess in a flanged collar 33 which engages the ends of the gauge bars 13 and holds them in close relation with the flange 16.

An inwardly projecting hub 34L of the collar 33 fits within a recess 35 in the supporting member 12 and thus prevents entrance of dust and dirt to the thread of the shaft 11. A. similar extension 36 on the member 12 extends into a recess in the body 10 for the same purpose.

A pair of adjusting and lock nuts 37 are mounted on the threaded end of the rod 31 and engage the end of the enlarged portion 17 of the shaft 11. These nuts may be adjusted to draw the shoulder 18 of the shaft portion 17 against the corresponding shoulder in the body 10 and to draw the flanged collar 33 against the gauge bars 13, causing the latter to contact firmly with the flange 16. End play throughout the different parts of the gauge is thus conveniently taken care of by a single adjustment.

The sleeve 22 may be removed if desired to provide convenient access to the nuts 37 when such adjustment is required. These nuts may be conveniently formed with notches similar to the nut 26 and may also be adjusted with a spanner wrench.

Having thus described our invention and the advantages thereof, we do not wish to be limited to the details herein disclosed otherwise than as set forth in the claims but what we claim is 1. An adjustable internal gauge comprising a body, a threaded actuating shaft rotatable in said body, a plurality of gauge bars movable relatively to said body and radially of said shaft, means to prevent axial and angular movement of said bars, a supporting member in which said bars are slidably mounted at an inclination to the axis of said shaft, said member being threaded on said shaft, a nut non-rotatable but axially movable relative to said member, and means to yieldingly move said nut axially relative to said member to provide tension for said actuating shaft. f"

i 2. An adjustable internal gauge comprising a body, a threaded actuating shaftrotatable in said body, a plurality of gauge bars movable relatively to said body and radially of said shaft, means to preventaxial and angular movement of said bars, a recessed supporting member in which said bars are slidably mounted at an inclination to the axis of said shaft, said member being threaded on said shaft, a nut also threaded on said shaftand received in said recess in said member, said nut being provided with notches and said member having a locking device fitting any one of said notches, and. a spring to yieldingly separate said nut and member axially.

3. An adjustable internal gauge comprising a body, axially recessed, threaded, actuating shaft rotatable in said body, a plurality of gauge bars movable relatively to said body and radially of said shaft but held from angular movement relative to said body, a supporting member in which said bars are slidably mounted at an inclination to the axis of said shaft, said member being threaded on said shaft, a collar engaging the outer ends of said gauge bars, and means to draw said collar close against the ends of said bars, said means extending through the recess in said shaft and being adjustable axially therein.

4. An adjustable internal gauge comprising a body, an axially recessed, threaded, actuating shaft rotatable in said body, a plurality of gauge bars movable relatively to said body and radially of said shaft, means to prevent angular movement of said bars, asupporting member in which said bars are slidably mounted at an inclination to the axis of said shaft, said member being threaded on said shaft, a collar engaging the outer ends of said gauge bars, a rod engaging said collar and extending through the recess in said shaft, and adjusting nuts at the opposite end of said rod, acting against said shaft and effective to draw said collar close against the ends of saidbars.

5. An adjustable internal gauge comprising a body, an axially-recessed, threaded, actuating shaft rotatable in said body, a plurality of gauge bars movable relatively to said body and radially of said shaft, but

held from angular movement relative to said body, a supporting member in Which said bars are slidaloly mounted at an inclination to the axis of said shaft, said member being threaded on said shaft, a flanged collar engaging the outer ends of said gauge bars, means extending through the recessed shaft and effective to draw said collar close against the ends of said bars, said means comprising a threaded rod having an enlarged head 10 seated in said collar and adjusting and look nuts for said rod, and means on said shaft enclosing said nuts after adjustment.

In testimony whereof We have hereunto affixed our signatures.

HAROLD L. PETERSON. STANLEY W. BATH. 

